Calculator.



PATENTED MAY 8, 1906.

P. W. BENNETT.

CALCULATOR.

APPLICATION FILED .TAN.18, 1905,

5 SHEETSSHEBT 1.

IIIE IIIII INVENTOH .z'anfi'z'ffienzzeii ATTORNE No. 819,715.'- PATENTED MAY 8, 1906.

F, W. BENNET L.

CALCULATOR. APPLICATION PILBD JAN. 18, 1905.

5 SHBETS-SHEET 2.

g4 flan/amaze 220i? PATENTED MAY s, 1906.

P. W. BENNETT. CALCULATOR. QPPLIOATION FILED JAN: 18, 1905.

I 5 SHEETS-SHEET 3.

. INVENTIOB fluid 71 5551272 5? WITNESSES:

PATENTED MAY 8, 1906 F. W. BENNETT.

GALGULATOR. APPLICATION FILED JAN.18,,1905,

6 8HEETS-BHEET 4.

INVENTOR jfazzfiwenneii WITNESSES:

N0-.'s19,715; PATENTED MAY 8, 1906.

P. W. BENNETT.

CALCULATOR.

APPLIOATIQN FILED JAN. 18, 1905.

5 $HEETS-SHEET 5,

\ meansof which mathematical calculations-- Land division'may be performed mechan-- and Imp transmitting from one indicating-wheel, to

- with parts broken section, showing the rear of two of the -:,tail perspective of the "UNITED 'sra'r ns PAT NT; orrion.

Application filed January 18,

7'0 (Ll/Z whom, it may cor Decree:

Be it known that I, FRANK W. BENNETT, a citizen of the United States, and a resident of Vl/ aterbury, in the county of New Haven and tate of Connecticut; have invented a new roved Calculator, of which the fol lowing 1s a full, clear, and exact description;

The invention relates to an apparatus by such as addition, multiplication, subtraction,

ically. r

' The underlying object of the invention is simplify the parts of the machine and to enable the calculations to be performed by less movements and in shorter time than heretofore. I'nattaining this end I rovide a keyboard'composed of nine keys, wit which are arranged any desired number of indicating-wheels, these wheels representing, respectively, units, tens, hundreds, thousands, &c., and devices are rovided by means of which. any one of these teys may be connected with the desired indicating wheel, so that a certain key may bythe adjustment of these devices be struck to indicate one unit,-=one ten, orone hundred, as may be desired, This, it will be observed, enables me to perform all of'theoperations necessary in the machine by means of only nine keys. I also provide de' vices foi' -cutting out of action means for the other,- these devices being utilized certain calculations, as will fully appear hereina ter. I

. Reference is had to the accompanying drawings, which illustrate, as an example, the preferred embodimentof my'invention, and in which drawings like characters of reference indicate like arts, and in which Figiire 1 is a p an view of the apparatus away to disclose the indicating-wheels and adjacent parts. Fig. 2 is a vertical section on the line 2 2 of Fig. 1. Fig. 3 is a fragmentary elevation with parts indicating-wheels and their adjacent parts. Fig. 4 is. a fragmentary perspective showing the device for transmitting from one indicating-wheel to the other. and alsothe device for throwing these devices temporarilyfout of action. Fig, 5is a fragmentary cross-see tion on the line 5 '5 of Fig. 2. Fig. 6 is a delock, device for preventing excess ve movement of the indicating wheels, 7, -:-1s alfragmentary eleval Specification'of Letters Patent.

,peripheral recess 20",

which will be fully set forth hereinafter.

two here shown each to nine, said Eatented May 8,1906. 1.905. ilerial No. 241,658

tion of one of the indicating-wheels, showing the shaft in section on the line 7 7 in Fig. 3 and illustratin with the she t to return the indicatingwheels to zero. Fig. 8 is a sectional plan of the parts on the line 8 8 of Fig. 7, Fig. 8 also showing one of the-ratchets attached to the indicating-wheels to turn one from the other and the thumb-wheel on the main shaft by means of which the indicating-wheels are returned to zero. Fig. 9 is a sectional elevation on the'line 9 9 of fragmentary longitudinad section on the line 10 10 of Fig. 9.

The apparatus is rovided with a casing.

15, which may be 0 any desired form and which is provided. at its top with observationopenings-15 to permit of observation of the mdicating-wheels, tl'ie'openings being one for each wheel, as shown. This casing 15 con tains all of the operative parts excepting the various keys and the thumb-wheel for resetting thei'ndicati'ng devices.

Revolubly mounted in the casing 1 5 is a main shaft '16, which exte'nds transversely through the casing and is provided at oni endwith a thumb-wheel 17, keyed to the shaft. The thumb-wheel has a rojecting lug 18,- carrying a pin 19, this pin 'ttin T in a formed in a dist-20, mounted loosely on the shaft -16 ahd lying against the outside of the casing 15'. Said diik 20 has a lug 20 projecting beyond'its -pe ipheryat a oint opposite its recess 20, and eoacting with this lug is a stud 2!, at-- tached tothe casing 15'. These devices serve one of the pawls which coact Fi 1, and Fig. 10 is a to control the rotating movement of the shaft 16 to reset the indicating-wheel in a manner )2 indicates the indicating wheels or devices These are provided with broad eripheries having regularly-spaced outward. -y-pro iect ing teeth 23, and between which teeth are produced numbers running from zeroto nine, as shown in Fig. 1. According to the strucindicatingavheel is provided with'four'groupsofnumbers from zero sively around the periphery of the wheels; The wheels 22 have hubs 2 1 loosely mounted on the shaft 16. Each hub 24 carries securely a small ratchetqvheelx 25, a'nd atthe other side of the indicating-wheel a relatively large ratchet 26 is arra'n ed, these ratchetsby means of bolts perform, in additionto the being secured to the wheel 27. The bolts 27 groups being arranged succesfunction of holding the ratchets 26 in place, the function of actuating the means for transmitting from one indicating-wheel to the other, to carry, for instance, ten units over to the tens indicating-wheel, and since the construction here illustrated provides for four groups of numbers from zero to nine for each indicating-wheel it follows that there must be four of the projecting bolts 27. Each indicating wheel also carries a pawl 28, pressed into active position by a spring 29. The pawls 28 project through openings '24'" in the hubs 24 and engage ratchet-like notches 16, formed on the shaft. The notches 16 are one for each pawl 28 or indicatin -wheel '22 and are arranged in longitudina alineting the disk.

ment on the shaft, so as to permit resetting or returning the indicating-wheels to zero. This is done by turning the shaft 16 in the direction of the arrow a in Fig. 7 until all of the pawls 28 fall into their corresponding "avi-' ties 16 and the indicatingavheels, moving with these pawls, reach the zero position, at which time the lug 20 of the disk 20 will strike the stop or stud 21, and further movement will be arrested. By reason of devices which will be hereinafter described the indicating-wheels 22 are permitted to rotate but in one direction, and the disk 20 and its immediately-coacting parts are provided to enable the shaft 16 to be returned idly to. the starting-point prior to the operation of reset- The notch 20 in the disk is elongated, as shown, and this is for the purpose of permitting the shaft 16 to take a full rotation or a slightly more than a full .rotation during the resetting operation, thus 'insuring that all of the pawls 28 engage in their corresponding cavities 16".

Theindicating-wheels are intended to turn only in the direction indicated by the arrow 1) in Fig. 2, and to prevent backward movemeritv I provide each ratchet 26 with a pawl 30. These pawls are mounted loosely on a shaft 31, which extends across the rear ortion of the casing back of the indicatingwheels, the pawls lying by gravity on the upper portions of the ratchets, as shown in Figs. land 2. Below the shaft 31 and slightl forward therefrom is a shaft 33,' on whio are loosely mounted a series of sleeves 34. Each sleeve is provided with an arm 35, and said arms reach upward and inward between the respective indicating wheels 22 and their ratchets 26, so as to be engaged byfthe bolts.

27, and therefore as the indicating-wheels rotate a rearward swinging movement will be imparted to the arms 35 each time that a bolt- 27' engages the 4 arms. The sleeves 34 will therefore turn on the shaft 33. Each sleeve 34 also carries an arm 36, these arms projecting forward, respectively, under the ratchets 26. Attached to each arm 36 has in 37, carrying an elbow-shaped dog 33. his dogs 38 are pressed into action by springs 88, and

' grasping the slide.

one arm of each dog engages its respective ratchet 26, as best shown in Figs. 2 and 4. .The remaining arms of the dogs 38 project rearward under shoulders 39*, formed on vertically-extending rods 39. The rods 39 are vertically movable and are carried at their lower ends in a rack 40, rigidly secured in the casing 15. At their upper end the rods 39 project through the top of the casing 15 and are provided with keys 41. On the under side of the top of the casing 15, at the rear thereof, two horizontally-disposed guides 42 are arranged. In these guides a s l.de 43 is mounted. Said slide is formed with openings 43 therein, (best shown in Fig. 4,) and each rod 39 is provided with a tapering rojection'39 normally located above the s ide.

The rods 39 are held in their normal position i (see Figs: 2 and 4) by means of the springs 38 Upon depressing one of the rods, however, the inclined part 39 thereof will engage the slide 43 and'move the same longitudinally until the projection 39 passes below the slide,

whereuponthe' sl'de under the action of a spring 44 will return to its normal position and lying over the projection 39 will hold the rod depressed. The parts remain in this position until. a further rod 39 is depressed, whereupon a-second movement is given to the slide 43, which results in the release of the rod 39 first depressed and in the catching ofv the other rod holding this other or second rod depressed as was the first.

It will be seen,

therefore, that when one rod is depressed it is locked by the slide, and when the second rod is depressed the first rod is released and the second rod locked. Any one or all of the rods may be released at will by giving the slide 43 manual movement contrary to the spring 44, for which purpose one end of the slide maybe projected beyond the casing to admit of Therefore as one of the indicating-wheels turns and as its movement continues until one of the bolts 27 strikes the corres onding arm 35 the sleeve 34 will be rocke and through the action of the arm 36 the dog 38 will impart a movement to the ratchet 26 of the next adjacent indicatingwheel, and this indicating-wheel will be turned sufficiently to change its position one number, thus carrying, for example, ten units from the units-wheel over to the tens-wheel and causing the latter wheel to change, for

example, from one to two. When it becomesnecessary to arrest this operation, as is neccessary in certain calculations the ke 41 corres onding to the indicating-whee involve the corresponding dog 38 out of operation and rendering the rocking of the sleeve 34 in effective.

Mounted in position to engage each minor ratchet 25 is a toothed or ratchet bar 45.

These bars have their toothed partssl ghtly curved, as shown in Fig. 2, so as to insure should be depressed, thus. throwing 3O Y engagement'with the ratchet45.

- ment be imparted to the mounted on' its lower their correct engagement with their ratchets,

and each bar is pivotally j oined toa swinging plate or member 46. Said member is hingedly and is held rigidly, as shown in Fig. 2, by means of a retractile spring 48. The ratchet-bars 45 are held only disengaged from their ratchet, as shown at the right-hand side of Fig. v3, by means of pins 49, lying under the ratchetbars and carried by arms 50, respectively, ,depending from key-levers 51. Said key-levers are mounted to swing around-the shaft 31 and are held normally raised by retractile springs 52. The key levers project forward and have bars 53 hinged thereto. Said bars project upward throu h the top of the casing and are provided with eys 54. The bars 53 proj set through a guide 55, similar in functiorr'to' the guides 42-, and they engage a slide 56, similar in funct1on to the slide 43., Said bars are providedwith shoulders or projections 53, similar to the projections 39 before described. l/Vhen, therefore, any one of the keys 54 is depressed, it is'locked in this depressed positlon and remains there until a second key is depressed, whereupon the first key is released and the second key is locked. Upon depressing any one of the key-levers 51 the ratchet-bar'45 corresponding thereto drops into active position, or, in other words, into (SeeFig. 2 and the left-hand side of 'Fig. 3.) Now, therefore, upbn depressing one of the keys 54 and allowing one of the correspondin ratchets 45 to drop, as described, upon thei orward movement of the swinging member 46 the ratchet-bar will impart a turning movement to its corresponding indicating-wheel, and the extent, of this movement will depend upon the extent of the outward motion of the swinging member 45-11. 0., if a short move cating-wheel willbe 'gfven a short turning movement,,and if the swinging member'46 be swung to the limit of its forward movemerit a maximum turning mdvementwill be imparted to the turning wheel. or so operating the swinging'member 46 I provide main key-levers 57. Said levers are mounted to swing around the shaft 31 and extend forward to the front of the casing 15, where they are provided with vertical extensions 57, projecting through openings in the casing, and they are provided at their 11 per extremitieswith major numbers from l'to 9 an the minor numbers from"1" to ,8, as shown in Fig. '1. Each main key-lever 57 is provided with a cam-surface 57 andthese camsurfaces have each a distinct profile, the angularityof which is in consonance with the value of the major number marked upon the key in court action with themain'key-lever's. For example,'the main ke -lever bearing the minor number 1 (see Fig. 1) has a cam 57 edge, as indicated at 4'7,

' quently major number 9 member46 the-indie (See Fig. 5.) With these of the sharpest angularity, so that it imparts a minimum movement to the swinging member 46, and the main key-lever, the key of which bears the major number 9, has a cam 57 of the least angularity, so that it imparts a maximum movement to the swinging member 46. By these means I am able to impart to each indicating-wheel a movement precisely equivalent to the value ofthe key which is struck. It will also be observed that any one of the main keys 58 may be 'placed in connection with any one of the indicating-wheels to the exclusion of the other keys, and this through the operation of the keys 54 and their connected parts' (louse-- to register nine units the key 54 re-' lated to the units indicating-wheel should be depressed and the main key 58 bearing the should be de ressed. Upon thedepression of this main ey the swinging member 46 will be moved outward and will carry with it all of the ratchet-bars '45; butsince only the bar of the units indicating-wheel has been dropped into position this bar alone will be active, and the result isthat'nine units "are registered on the units indicating-Wheel. If it be desired to register nine thousand, the key 54 bearing the word thousandsindicating-Wheel should be depressed. This will release the units-key 54 and its connected parts and will dro and look into position re ated to the thousands the ratchet-bar 45 indicating-wheel Then upon depressing the main key 58, bearing the major numeral 9, the number 9,000 will be registered by the operation of the parts as before explained.

Since each mam key-lever 57 has a cam 57 b of characteristic form, and since the desired operation of the indicating-wheel is de endout upon these-devices, it is essential t at in 'operation eachfihainkey lever should be depressed to the end of its downward movement. To insure this, I provide each lever with a ratchet 59. Coacting with each ratchet'is a spring-hook 60, these hooks being carried by a suitable 'supportin bar 61. The hooks are provided with literallywidene d portions terminating in shoulders 60 respectively, 7 at the upper and lower extremities of the widened portions. widened portions pins 62, carried by the levers 57, coact. The arts normally assume the osition shown in i s.-2 and 5, in which the face of the ratchet 59%ies out of the line of the bill of the hook 60. When one of the main levers 57 is de ressed,

the in 62 of eachlever runs along t e diagona y disposed hook --60 and presses the same into engagement with the ratchet 59,

the pin 62 engaging the widened portion 60 of said hook. This operation continues until thelever isdepressesufficiently to run the pinv 62 ofi of the widened portion 60 ower shoulder 60 thereof.

The hook 60 and related to the thousands IIO past the I30 will then swing back to its normal position clear of the ratchet 59. This-releases the ratchet and permits th'retum of-thelever to which the ratchet is attached. The widened rocker-sleeve 65, mountec their movement.

ward from t portions of the hooks 60 are of 'a length corresponding precisely to. the full throw of the levers 57, and it will be seen,.therefore, that should a lever be depressed but part of its throw it cannot be released until it is wholly depressed, and this insures full movement of the main key-levers upon each.

operation thereof. In order to prevent the indicating-wheels from receiving excessive turnihg movement-fthat is, turning-by momentumI provide a locking device, (Best shown in Figs. 2 and 6.) This comprises a lock-bar 63, whichcoacts with the teeth 23 .of the indicating-wheels and when raised into engagement therewith. will prevent the turning of the wheels. Said lock-bar 63 is carried by arms 64:, proy'eeting from the 'on'a transverse shaft 66, loeatedjust below the pivot 4.7 of theswingin member 46. Projecting fore rocker-sleeve 65 area number of arms 67, corres ondin to the main key-levers 57., and s0 ispose as to be engaged by heel-like portions 57 formed on said levers, the arrangement. being such that this engagement does not take place until the instantthat the key-levers reach the end of Consequently when one of the levers is depressed it performs the necessary operation and'then engages its corresponding arm 67, turning up the lock-bar 63 and preventing idle movement of the indieating-wheels.

In the use of the apparatus the parts are adjustedlas shown, and the main keys 58 are mani ulated with the. keys 54, so that any one o the mainkeys'may be made to impart.

to any one of the indicating wheels a turn exactly commensurate to the value of the ma- I j'or numeral produced on the main key being 45 operated. The cut-out keys 41 maybe actuated from time to'time to cut out of operation' anyone of the transmitting devices, so as to prevent carrying from one indicating- Wheel to the other this latter-operation being necessary in performing some calculations-v for instance in. subtraction and division.

' The action ofthe machine in calculating is similar to that of machines heretofore devisedin this class andvwill, it is believed, be S5 understood from the prior art. For example,-addition is carri'edon by the simple process of striking the various main keys bearing the numbers to be addedyoperating the ke s 54 meanwhile, and leaving in operation t is transmitting devices, so that I results will be carried from-one indicating-wheel to the other, as is usual int-numbering mechanism.

Multi lication is carried on byfirst voperat ing t e machineto show the rnultip cand.

h g t p ings 15* and then. striking first indicated in the machine,

:thereon. For example, fort -one d'vided'by sixty-eight the figure sor is to be struck six times. .ingsfigu-re should have one or more added to it while the divisor. is being struck, then the divisor (less one) should be struck the addieach main key 58 hearing in major charac ters the-number or numbers of the multiplier .a number of times corresponding to the numbers of themu'lti :two hundred an licand. With-theexample twenty-two multiplied by four the procedure is as follows: 222 is and then the main key bearing the major number 4 is connected-With the units indicator-wheel and o eratedztwice, It is then connected with t e tens indicating-wheel.andoperated twice, and then finally connected with the hundreds indicating-wheel and operated twice, producing the result 888.

Subtraction is carried on by firstindicating' on the machine the minuend and then subtracting one from the subtrahend and strikhand .;6, making the-subtrahend used in- ;the calculation 5. 'bearin' the minor number .5 should be Then the main key 58 coup withthe units indicating-wheel andv then depressed In dividing, the amount of the dividend is placed onthe machine bystriking the keys .58 accordingto the large figures thereon.

Then the divisor'is struck accordingto the small figures on the keys 58, asfollows: In the fewest figures at the left of the dividend which exceed the. d'visor and which are first to be divided there is usually. one more figure 'thanxthe divisor contains, and thisextra figure at the left of the corresponding order of figures eithe' divisor indicates how many times the divisor (less one). should be struck on keys. 58 according to the small figures in six hundred and 6 in the dividend indicates that the divi- If the indicattional number of times corresponding to the amount .addedtothe indicating-number, it any has been added to it.

aving thus described the preferred form sire to secure by Letters Patent, is I 1. A- calculator comprising. a case, .a'plurality of indicating devicesfthere'in," means I fortransmitting from one indicating'device to the other, means for throwing the transmittin means out of operation at will, keys located outside ofJthe ease and; connected of my invention, what I claim as new, and deing om one indicating device to the other, means f means with the indicating devices, and keys n connection with the last-named means and projecting outside of the case.

2.. A calculator comprising a case, indicatforthrowing the transmitting device out of action at W111, keys in connection with the last-named means, operating meansfor the indicating devices, keys for the o crating means, the keys projecting outside 0 the easmg, means for connecting any one of the operating means with any one of the indicating devices, and keys for said connecting means, the keys projecting outside of the casing.

In a calculating-machine, the combination of a plurality of indicating devices, a plurahty of'operating members, a swinging member adapted to be moved by said operating members, devices in connection with the swinging member and respectively coacting with the indicating means, and means for throwing said devices in and out of action.

4. In a calculating-machine, the combina tion of a plurality of indicating devices, aplurality of operating members having cams thereon, a movable member engaged with.

and operated bysaid cams, means for operatmg the indicating devices, said means being connected with means for throwing the means for operating tfllig indicating devices in and out of action at 5. In a calculating-machine,-the combination of an indicating device, alratchet in con nection therewith, a ratchet'bar coacting with the ratchet, a movablem'ember connected with the ratchet-bar, a swinging lever hav- I mg a cam engaging the movable-member,

a with each ratchet, means'for m and means for movin said ratchet-bar in and out of action at w' l. v I

6. In a calculating-machine, the combination of a plurality of indicating device's, an operatin means for each, devices-for throwing the 0 cratin means in and out of action indepen ently 0 each other, amovable member with which said operating means are connected, and devices for imparting variable movement to said movable member, said de- V1085 comprising swinging levers having unlike cams thereon engaged with said movable member.

7. In a calculator, the combination of' a plurality of indic ng devices, a ratchet in connection with e on, a ratchet-bar coacting mg the ratchet-bars in and out of action ently of each other, a movable member in .CODIIGOUOI] wlth the ratchet-bars, and means devices-therein, means for transmitting or, the combinatlon of a plurality of indicating devices, an operating said movable member, and

dependfor imparting variable movement to said movable member.

8. In a calculator, the combination. of a plurality of indicating devices, a ratchet in connection with each, a ratchet-bar coacting with each ratchet, means for moving the ratchet-barsin and out of action independently ofeach other, a movable member in connection with the ratchet-bars, and means or imparting variable nTovcment to said movable member, said means for imparting variable movement to the movable member comprising a plurality of levershaving unlike cams thereon.

9. In a calculator, the combination of a plurality of indicating devices, .rneans for operating each, a key-actuated means forthrowingthe operatin means in and out of action independently oi each other, a movable mem her in connection with said operating means, a key-operated means for impartmg variable movement to said movable member, means.

for transmitting from one indicating device to the other, anddevices for throwing-said transmitting jmeans in and out of action at .10. In a calculat means for each, devices including a key for moving the operating means in and out of action independently of each other, each of said devices'also including an incline shouldered part, asliding lock coacting with the said incline shouldered parts, means foryieldin 1y pressing the lock in one direction, a mova le member in connection With th indic'atmgde- .vices, operating means, and means for maparting a variablemovement to said movable I-nember.

11. In a calculator, the combinationota plurality of indicating for throwing said transmitting means in and out ofaction at will, said devices including key-operating parts tions, a sliding lock jec'tions, and means lock in one direction.

12. In a calculating-machine, the combination of a plurality of indicating devices, a movable'member, devices in connection with the movable member andadapted respecively to operate the indicating devices, means for throwing out of action any one of coacting with said proyieldingly pressing the said devices inconnection'withjthe movable,

and a plurality, ofoperatmg-keys" I20 member, having unlike cams adapted to engage the movable member.

13. In an indicating-machine, the combination of a plurality of indieating' .devices,

a movable member, the movable member, ratchetsm connection devices, ineans for, transmittmg from one to the h devlces F having inclined .projc-"' means for transmitting from one to the other,

ratchet-bars carriedby- 5,

with the indicating devices and respectively coacting with the ratchet-bars, means for throwing any one of the ratchet-bars out of action at will, and means for imparting variable movement to said movable-member.

14. In an indicating-machine, the combination of a plurality of indicating devices, means for transmitting from one to the other, a movable member, ratchet-bars carried by the movable member, ratchets in connection with the indicating devices and respectively coacting with the ratchet-bars, means for throwing any one of the ratchet-bars out of action at will, and means for imparting variable movement to said movable member, said means comprising operating-keys hav ing unlike cams .thereon engaging the said movable'member.

15. In a calculating-machine, the combination of a plurality of indicating devices, means for operating the same, means for transmitting from one indicating device to the other for thepurpose specified, a key-actuated. rod coacting with the second-named means to throw the same out of action, and a sliding lock-plate adapted to engage a part of said rod to hold it in active position.

16. In acalculator the combination of a plurality of indicating devices, means or transmitting from one to the other, a movable member, keys having unlike cams there on adapted to impart unlike movements to the said member, normally inactive'operat ing devices in connection with said member and respectively adapted to operate the indicating devices and keys for independently throwing said operating devices into action at will.

17. In a calculator the combination of a plurality of'indicating devices, means for transmitting from one to the other, means forthrowing the transmitting means out of action at will, a movable member, keys hav-' ing unlike cams thereon adapted to impart unlike movements to the said member, normally inactive operating devices in connection with said member and respectively adapted to operate the indicating devices and keys for independently throwingsaid operating devices into action at will.

18. In a calculator the combination of a plurality of indicating devices, means for transmitting from one to the other, a ratchet in connection with each indicating device, a normally. inactive ratchet-bar coacting with each ratchet, keys for independently throwing the ratchet-bars into action, a movable member to which the ratchet-bars are connected, and keys having unlike cams thereon adapted to' act on and impart unlike movements to said movable members.

19. In a calculator the combination of a plurality of indicating devices, means for transmitting from one to the other, means for throwing the transmitting means out of action at will, a ratchet in connection with each indicating device, a normally inactive -r.at chet-bar coacting with each ratchet, keys for independently throwing the'ratchetba1's into action, a movablemember to whichthe ratchet-bars are connected, and keys having unlike cams thereon adapted to act on and impart unlike movements to said. movable members.

20. In a calculator the combination ol a plurality of indicating devices, means for transmitting from one to the other, keys for throwing the transmitting means out oi a ction at will, a ratchet in connection with each indicating device, a norm ally in active ratchetbar coacting with each ratchet, keys for independently throwing the ratchet-bars into ac tion, a movable member to which the ratchetbars are connected, and keys having unlike cams thereon adapted to act on and impart unlike movements to said movable members.

21. In a calculator, the combination o'l'- a plurality of indicating (le'vices, means fortransmitting from one to the other, means for throwing the transmitting .means in or out of action at will, a swinging member, devices in connection therewith for operating the indicating devices, means for throwing the operating devices into or out of action, an d means for variably operating the said swinging memben I in testimony whcreo'lyl have signed my name to this speci'lication m'the presence oi two subscribing"witnessesj ,FRANK- W. BEN N ETT:

W'itncsses:

.FnANoIs I. GUILFOILE, .llowmzin BAKER. 

